Towel rack



FIG. 1 is a perspective view of towel rack, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a right side elevational view.

The ornamental design for a towel rack, substantially as shown.